﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class swallow: Bird//燕子
    {
        public void Tothesouth() 
        {
            Console.WriteLine("我去南方");
        }
        public override void cry()
        {   
            base.cry();
            Console.WriteLine("叽叽叽");
        }
    }
}
